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Efficiency optimization of variable-frequency controlled power factor correction converters

  • Zhou, Yufei (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • He, Xueru (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Liu, Shuai (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Hong, Feng (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Ren, Jiaqi (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics) ;
  • Li, Dongdong (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics)
  • Received : 2021.09.17
  • Accepted : 2022.02.10
  • Published : 2022.06.20

Abstract

More attention is being paid to energy efficiency and harmonic reduction. Thus, power factor correction (PFC) is widely used in power supplies. However, under the condition of light load, the single-stage LLC PFC converter has the problems of low efficiency and output voltage misaligned, such as other PFC topologies. Aiming at the problems that occur under light load conditions, this paper proposes a least-pulse delta (Δ)-sigma (Σ) modulation (LPΔ-Σ modulation). Under different loads, the system can automatically select the appropriate pulse density and reduce the energy transfer to the secondary side by uniformly turning of the driving signals, which stabilizes the output voltage and improves the system efficiency. Mean-while, LPΔ-Σ modulation is more beneficial for improving the PF value when compared with the burst mode under light load conditions. Experimental results show that LPΔ-Σ modulation based on the traditional dual-loop control can effectively stabilize the output voltage and improve efficiency. When compared with the existing burst control scheme, it reduces the output voltage ripple and effectively improves the PF.

Keywords

References

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